<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <div id="app">
        <header ref="header">头部</header>
        <div class="con">
            <div :up="up">
                <ul>
                    <li v-for="(item,index) in list" :key="index">{{item.title}}</li>
                </ul>
            </div>
        </div>
        <footer>底部</footer>
    </div>
</body>
</html>